@jsonjoy.com/json-pointer
v1.0.0
Published
High-performance JSON Pointer implementation
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1,984
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JSON Pointer - json-pointer
Fast implementation of JSON Pointer (RFC 6901) specification in TypeScript.
Usage
Can find a value in a JSON object using three methods: (1) JSON Pointer string, (2) array of steps, or (3) a pre-compiled function.
Examples
Find the value in a JSON document at some specific location.
Find by JSON Pointer string
import { findByPointer } from '@jsonjoy.com/json-pointer';
const doc = {
foo: {
bar: 123,
},
};
const res = findByPointer(doc, '/foo/bar');
Find by path array
Alternatively, you can specify an array of steps, such as ['foo', 'bar']
. Or,
use the parseJsonPointer
function to convert a JSON Pointer string to an array.
import { find, parseJsonPointer } from '@jsonjoy.com/json-pointer';
const doc = {
foo: {
bar: 123,
},
};
const path = parseJsonPointer('/foo/bar');
const ref = find(doc, path);
console.log(ref);
// { val: 123, obj: { bar: 123 }, key: 'bar' }
Pre-compiled function
If you know the path in advance, you can compile a function that will find the value at that location, it will work few times faster than the previous methods.
import { $$find } from '@jsonjoy.com/json-pointer/lib/codegen';
const doc = {
foo: {
bar: 123,
},
};
const finder = $$find(['foo', 'bar']);
const res = finder(doc);
Low-level API
Convert JSON Pointer to path array and back.
import { parseJsonPointer } from '@jsonjoy.com/json-pointer';
console.log(parseJsonPointer('/f~0o~1o/bar/1/baz'));
// [ 'f~o/o', 'bar', '1', 'baz' ]
console.log(formatJsonPointer(['f~o/o', 'bar', '1', 'baz']));
// /f~0o~1o/bar/1/baz
Decode and encode a single step of JSON Pointer.
console.log(unescapeComponent('~0~1'));
// ~/
console.log(escapeComponent('~/'));
// ~0~1